package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
//import javax.servlet.http.HttpSession;

import jakarta.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.验证手机号
            if(RegexUtils.isPhoneInvalid(phone)){
                //2.如果不符合，返回错误信息
                return  Result.fail("手机号格式错误");
            }
        //3.符合生成验证码
        String code = RandomUtil.randomNumbers(6);
            stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //4.保存验证码到session
        //session.setAttribute("code",code);
        //发送验证码
        log.debug("发送验证码成功,验证码：{}"+code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号和验证码
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            return  Result.fail("手机号格式错误");
        }
        //2.验证验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if(cacheCode==null||!cacheCode.toString().equals(code)){
            //3.不一致报错
            return Result.fail("验证码错误");
        }

        //.一致，根据手机号查用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if(user==null){
            //6.不存在，创建用户
          user =   createUserWithPhone(phone);
        }

        //1.随机生产token，登录令牌
        String token = UUID.randomUUID().toString(true);
        //2.将User对象转化为hashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        //将userDTO里面的字段全部转换成字符串
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        String tokenKey = LOGIN_USER_KEY+token;
        //3.存储
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        //时间限制，超过30分钟，用户自动退出
        stringRedisTemplate.expire(tokenKey,30,TimeUnit.MINUTES);
        //7.返回结果
        return Result.ok(token);
    }


    //退出登录
    @Override
    public Result exitlogin(String token) {
        String key = RedisConstants.LOGIN_USER_KEY+token;
        stringRedisTemplate.delete(key);
        return Result.ok("成功退出");
    }


    public User createUserWithPhone(String phone){
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));

        //保存用户
        save(user);
        return user;
    }
}
